The Standard of Practice (Alberta Private Sewage Systems Standard of Practice 1999) sets out design standards, installation standards and material requirements for on-site private sewage systems handling less than 25 cubic metres (5500 Imperial gallons) expected sewage volume per day, and which include:
(a) holding tanks and septic tanks,
(b) packaged sewage treatment plants,
(c) disposal fields,
(d) treatment mounds,
(e) open discharge systems,
(f) sewage or effluent lagoons, and
(g) sand filters
The objective of a private sewage system designed and installed in accordance with the above Standard is to treat and dispose of sewage and effluent so that the sewage or effluent does not present a risk to public health and does not cause degradation to the environment.
A private sewage system shall not be installed on a property:
- that is less than 1800 sq m (19500 sq ft) unless the lot was created prior to July 1, 1992;
- that is not of sufficient size to meet all minimum distance requirements for the intended system, and where site conditions on the property are not able to support a self sustaining private sewage system.
An evaluation to determine that the characteristics of the site meet the requirements should include, but is not limited to:
- the existence and distance to limiting barriers in the soil such as an impervious layer of high water table;
- the location and size of bodies of water;
- surface water drainage characteristics;
- volume and strength of the sewage generated by the facility being served;
- classification and percolation rates of soils to establish the types and sizes of systems that may be used for treatment and disposal; and
- the area available for the sewage system and distance requirements to property lines, bodies of water and water sources.
For more information about regulations and development of septic systems on rural properties, contact Planning and Development.